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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
package com.google.protobuf;
/**
* Abstract interface for an RPC channel. An {@code RpcChannel} represents a communication line to a
* {@link Service} which can be used to call that {@link Service}'s methods. The {@link Service} may
* be running on another machine. Normally, you should not call an {@code RpcChannel} directly, but
* instead construct a stub {@link Service} wrapping it. Example:
*
*
* RpcChannel channel = rpcImpl.newChannel("remotehost.example.com:1234");
* RpcController controller = rpcImpl.newController();
* MyService service = MyService.newStub(channel);
* service.myMethod(controller, request, callback);
*
*
* Starting with version 2.3.0, RPC implementations should not try to build on this, but should
* instead provide code generator plugins which generate code specific to the particular RPC
* implementation. This way the generated code can be more appropriate for the implementation in use
* and can avoid unnecessary layers of indirection.
*
* @author [email protected] Kenton Varda
*/
public interface RpcChannel {
/**
* Call the given method of the remote service. This method is similar to {@code
* Service.callMethod()} with one important difference: the caller decides the types of the {@code
* Message} objects, not the callee. The request may be of any type as long as {@code
* request.getDescriptor() == method.getInputType()}. The response passed to the callback will be
* of the same type as {@code responsePrototype} (which must have {@code getDescriptor() ==
* method.getOutputType()}).
*/
void callMethod(
Descriptors.MethodDescriptor method,
RpcController controller,
Message request,
Message responsePrototype,
RpcCallback done);
}